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hashmap: introduce hashmap_free_entries

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`hashmap_free_entries' behaves like `container_of' and passes
the offset of the hashmap_entry struct to the internal
`hashmap_free_' function, allowing the function to free any
struct pointer regardless of where the hashmap_entry field
is located.

`hashmap_free' no longer takes any arguments aside from
the hashmap itself.

Signed-off-by: Eric Wong <e@80x24.org>
Reviewed-by: Derrick Stolee <stolee@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Wong
2019-10-06 23:30:40 +00:00
committed by Junio C Hamano
parent 8a973d0bb3
commit c8e424c9c9
17 changed files with 52 additions and 34 deletions
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19
hashmap.h
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@ -96,7 +96,7 @@
* }
*
* if (!strcmp("end", action)) {
* hashmap_free(&map, 1);
* hashmap_free_entries(&map, struct long2string, ent);
* break;
* }
* }
@ -232,13 +232,20 @@ void hashmap_init(struct hashmap *map,
const void *equals_function_data,
size_t initial_size);
/* internal function for freeing hashmap */
void hashmap_free_(struct hashmap *map, ssize_t offset);
/*
* Frees a hashmap structure and allocated memory.
*
* If `free_entries` is true, each hashmap_entry in the map is freed as well
* using stdlibs free().
* Frees a hashmap structure and allocated memory, leaves entries undisturbed
*/
void hashmap_free(struct hashmap *map, int free_entries);
#define hashmap_free(map) hashmap_free_(map, -1)
/*
* Frees @map and all entries. @type is the struct type of the entry
* where @member is the hashmap_entry struct used to associate with @map
*/
#define hashmap_free_entries(map, type, member) \
hashmap_free_(map, offsetof(type, member));
/* hashmap_entry functions */